This note covers the basics of angled backup iron sights for an AR-pattern rifle: where they ride on the rail, how the roll-over works, and how to confirm they still point where you expect. People often search for these as offset BUIS or AR-15 offset sights; the idea is the same either way.
Mount both sights on the same rail plane. Putting the rear on the receiver and the front on a handguard that does not line up with it can make zeroing harder or impossible.
A variable optic set to its lowest power is usable up close, but many shooters still prefer a wide, fast iron sight picture inside a few yards. The offset irons give that option without removing the scope. For reference, the set discussed here is Ozark Armament canted iron sights.
Plan for some point-of-impact change between the scope and the irons. Learn where each system hits at your common distances rather than assuming they agree.
Practice the roll dry first. Bring the rifle up on the scope, then rotate until the front post settles in the rear aperture, and back again. A smooth, repeatable cant matters more than speed at first.
The linked product is Ozark Armament's own listing on Amazon.